GRAIN SIZE EFFECTS ON THE THERMAL CONDUCTIVITY OF CERAMIC OXIDES
Technical Report
·
OSTI ID:4039497
Dense, fine-grained alumina samples were employed in a study of the effect of grain size on thermal conductivity in polycrystalline alumina. The thermal conductivity in the temperature range from 100 to 1000 deg C decreased slightly but significantly as the average grain size was varied from 10 to 4 to 2. The decrease in thermal conductivity with decreasing grain size was found to follow closely an additive reciprocal volume relationship, which was previously discussed by several investigators. The role of impurities in making this effect in dense alumina samples of purity exceeding 99% was shown by measuring the thermal conductivity of specimens with small variations in impurity content. The strength and modulus of elasticity of these fine grained aluminas were also measured. Several questions were raised concerning the data obtained which were not resolved. Dense samples of MgO were also produced using hot pressing techniques and strength and elasticity properties measured. These results are incomplete and not well understood. (auth)
- Research Organization:
- New York. State Univ. Coll. of Ceramics, Alfred
- NSA Number:
- NSA-15-022706
- OSTI ID:
- 4039497
- Report Number(s):
- ARL-5
- Country of Publication:
- United States
- Language:
- English
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